Chang-Hak Kim

Development of 5D CAD System for Visualizing Risk Degree and Progress Schedule for Construction Project

D CAD system visualizes the schedule data for construction project. Generally, 5D CAD system visualizes construction cost or resource data by linking 4D object. This study attempts to develop a 5D CAD system by linking 4D object for progress schedule data with the risk data for visualizing construction risk degree of each activity. This system uses the fuzzy analysis and AHP analysis procedures to estimate risk degree of each activity. And the system considers construction cost, duration and dangerous condition of work site as risk factors. The estimated risk degree of each activity is simulated with different colors by the risk level in 4D CAD engine that developed in this study. Because the 5D CAD system integrated with risk analysis data has creative functions comparing with the current similar systems, it can be a useful tool for visualizing practical risk data and progress schedule data.

Development of Improved 4D CAD System for Horizontal Works in Civil Engineering Projects

One of the purposes of using four-dimensional (4D) computer-aided design (CAD) system is to express numeric construction schedule data into a visual format. While existing 4D CAD systems are appropriate for building projects composed of vertical schedule progress and manufactured elements, the basic functions of those systems have limitations when directly applied to a civil engineering project, such as highway and railway facilities. Such projects include horizontal works, and their activities are carried out according to the elements of natural topography. This study attempts to develop a 4D CAD engine that supports analysis of the 4D objects for horizontal elements including a visual simulation of a cutting and filling status of an earthwork section in civil engineering projects. The system uses integrated information management techniques employing work breakdown structure for simulating 4D objects for each level. The developed engine includes new functions for visualizing work schedule and activity progress in highway and railway project with horizontal earthwork. Finally, to improve the practical applicability of a 4D CAD system, a new method for visualizing risk analysis data is suggested for future studies.

Development of BIM Functions and System for Construction Project Through Project Life Cycle-Focusing on Bridge Construction Project-)

Recently, BIM (Building Information Modeling) technique is being considered as a critical delivery condition for the public projects according to the increase of best practices by practical application of BIM. However, since existing BIM studies are focused on the design and construction phases, those results are not considering the life cycle of a construction project. Therefore, this study suggests an integrated BIM operation process that enables an application of BIM for each phase of a construction project from planning to maintenance phases and develops an integrated BIM system based on the suggested methodologies. This study developed basic BIM functions and its application process by analyzing information systems in each project phase for a bridge construction project. Besides, this study performed case study and survey analysis for construction managers to verify a practical applicability of the developed system. Therefore, it is expected that the integrated BIM system is going to be utilized as a 3D-based integrated information management system considering life cycle of construction projects.

A Comparative Analysis on Generated Construction Waste Quantities in a Case Study for Deconstruction of an Apartment

Abstract : Deconstruction of the building must be applied firstly in order to improve recycling and reuse of construction wastes. In this study have done a case study for deconstruction of an apartment. All construction waste(CW) which will be generated during deconstruction was examined in each part of the building. Because drawing did not exist in most of the old building, we drew up floor plans of buildings. After analyzing these drawings, estimated quantities of CW. It was measured working time of labor and equipments for deconstruction and general demolition on each building of the apartment. In addition, it was proposed in the volume and weight per unit after analyzing detailed measurement of CW which was generated in the process of deconstruction and traditional demolition. It suggested recovery rate at a site, volume and weight conversion factors, and waste basic unit per area that based on the results of comparative analysis on the amount of CW which is calculated from drawing and generated at a site. These factors will be used fundamental materials for estimating quantities and treatment cost of CW, and scheduling of works.

The Analysis and Suggestion of Demolition Industry for Sustainable Development

Since 2010, it is estimated that the old building to be dismantled potentially will be about 8.9 million house in domestic country. Consequently, now domestic demolition market size of about 1.5 trillion won is forecasted to be grow rapidly into the size of 5.8 trillion won. But in the domestic country, preparation of the raw and regulation for the demolition industry is very insufficient compared with advanced country, and the related research is also very insufficient. Therefore, in this study, it is performed to analyse and predict a trend of domestic demolition market after analysing a current trend in overseas demolition industry. A demolition industry is a related industry fallen behind over 25 years compared with a construction industry. The exact analysis of those trends will make it possible to set the standard for demolition waste management. Also this study suggests methods be able to develop the demolition industry into main area of construction industry through those analysis.

Application of augmented reality object in construction project

Because a construction project is being larger in size and complicated in structure, to be a successful construction project, various information technologies should be used for the project management through life-cycle. The representative IT tools are RFID/USN (Radio Frequency IDentification/Ubiquitous Sensor Network) and BIM (Building Information Modeling) system. BIM is that the construction information through the life-cycle of a construction project, including design, construction and maintenance phases, is managed by 3D objects. AR (Augmented Reality) can be used in the construction project as one of BIM item. AR technology can be used to establish a real-life construction model by overlaying virtual object data against the actual background of a project site on a computer. This study proposes a methodology of applying the AR technology to a construction project and a prototype system to test applicability of the AR technology in rebar construction work. Application of the AR technology to construction processes may enhance workability as it displays missing design elements compared to the initial drawings.

Application of VR Technology Linked with 4D CAD System for Construction Project

4D CAD system is a simulation tool for visualizing the finished appearance of construction facility by construction schedule. That is, project manager can continuously simulate the changed appearance of the facility with 3D type by each construction time schedule. Recently, the application of 4D CAD system is being increased by linking with VC (Virtual Construction) functions. Virtual construction methodology enables to construct project facility from design phase to construction phase in 3D virtual environment. It is a technique that can solve problems of construction in virtual construction process before real construction. This study suggests some methodologies for using virtual construction technology in the design phase of construction project. And the methodologies are verified by a developed virtual construction system linked with 4D CAD tool.